ADF02 Equivalent & Substitute Parts

Part Overview

The ADF02 is a slide-actuated DIP switch manufactured by TE Connectivity ALCOSWITCH Switches, configured as a single-pole single-throw (SPST) switch with 2 positions. The device is rated for 25mA at 24VDC and features through-hole mounting with PC pin termination. The ADF02 is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters.

Substiute Parts

ADF02

TE Connectivity ALCOSWITCH SwitchesIn Stock: 803ADF02 Datasheet

Current PartRFQ

1825002-1

TE Connectivity ALCOSWITCH SwitchesIn Stock: 12631825002-1 Datasheet

DirectRFQ

209-2LPST

CTS ElectrocomponentsIn Stock: 4450209-2LPST Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ADF02 are identified based on strict electrical and mechanical compatibility criteria. The primary substitution logic is as follows:

Direct Electrical Equivalents: Parts maintaining identical circuit configuration (SPST), position count (2), current rating (25mA), and voltage rating (24VDC) are classified as direct equivalents. These parts preserve all functional characteristics of the original ADF02 without derating or performance compromise.

Functional Substitutes with Derating Capability: Parts with higher current or voltage ratings than the ADF02 specification may be substituted in applications where the ADF02 electrical parameters are not fully utilized. These parts operate within the ADF02 design envelope while providing additional electrical margin.

The following parameters determine substitution eligibility:

• Circuit configuration (SPST required)
• Number of positions (2 required)
• Mounting type (Through Hole required)
• Termination style (PC Pin required)
• Pitch (0.100" / 2.54mm required)
• Actuator type (Slide Standard required)

Parameter Comparison

Engineering Selection Recommendations

1825002-1 (TE Connectivity ALCOSWITCH): This part is the primary direct equivalent for the ADF02. It maintains identical electrical specifications (25mA at 24VDC), mechanical configuration, and operating temperature range. The 1825002-1 is classified as Active product status, ensuring long-term availability and supply chain continuity. The part achieves ROHS3 compliance, addressing regulatory requirements for new designs. The 1825002-1 is supplied in tube packaging and is recommended as the first-choice replacement for ADF02 applications requiring direct functional equivalence.

209-2LPST (CTS Electrocomponents): This part functions as a substitute with enhanced electrical ratings. The 209-2LPST provides 100mA current capacity and 20VDC voltage rating, both exceeding the ADF02 specification of 25mA at 24VDC. The part is suitable for applications where the ADF02 electrical parameters are not fully utilized and where higher electrical margin is beneficial. The 209-2LPST features extended electrical life (2,000 cycles versus 1,000 cycles) and expanded operating temperature range (-40°C to 85°C). The part achieves ROHS3 compliance and is classified as Active. Height above board is 0.180" (4.57mm), compared to 0.189" (4.80mm) for the ADF02, representing a minor dimensional difference within typical PCB layout tolerances. The 209-2LPST is supplied in tube packaging.

Frequently Asked Questions (FAQ)

Q: Can the 1825002-1 be used as a direct replacement for the ADF02 in all applications?

A: Yes. The 1825002-1 maintains identical electrical ratings (25mA at 24VDC), circuit configuration (SPST), position count (2), mounting type (through hole), termination style (PC pin), and pitch (0.100"). The operating temperature range (-30°C to 85°C) is identical. The 1825002-1 is the direct functional equivalent and requires no circuit or layout modifications.

Q: What are the limitations of using the 209-2LPST as a substitute for the ADF02?

A: The 209-2LPST has a voltage rating of 20VDC, which is lower than the ADF02 specification of 24VDC. Applications operating at or near 24VDC may not have adequate voltage margin with the 209-2LPST. The 209-2LPST height above board is 0.180" (4.57mm) compared to 0.189" (4.80mm) for the ADF02, a difference of 0.009" that may affect PCB clearance in space-constrained designs. The 209-2LPST is suitable only for applications where the ADF02 voltage specification is not fully utilized.

Q: Are there packaging differences between the substitute parts?

A: Yes. The ADF02 is supplied in bulk packaging. Both substitute parts (1825002-1 and 209-2LPST) are supplied in tube packaging. Tube packaging provides improved component protection and handling characteristics for production environments.

Q: Do the substitute parts meet RoHS compliance requirements?

A: Yes. Both the 1825002-1 and 209-2LPST are ROHS3 compliant. The original ADF02 is RoHS non-compliant. New designs should specify either substitute part to meet current regulatory requirements.

Q: What is the mechanical life difference between the ADF02 and substitute parts?

A: The ADF02 specifies 1,000 mechanical cycles. The 1825002-1 also specifies 1,000 mechanical cycles. The 209-2LPST does not provide a mechanical life specification in the available data. For applications requiring extended mechanical life data, the 1825002-1 is the recommended choice.

Q: Can the 209-2LPST be used in a 24VDC circuit?

A: The 209-2LPST is rated for 20VDC maximum. Operation at 24VDC exceeds the part specification and is not permitted. The 1825002-1 is rated for 24VDC and is the appropriate choice for 24VDC applications.

Q: Are there contact material differences between the parts?

A: Yes. The ADF02 and 1825002-1 both use copper alloy contacts with gold finish. The 209-2LPST uses beryllium copper contacts with gold finish. Beryllium copper provides enhanced electrical and mechanical properties. Both contact materials are compatible with standard PCB assembly processes.